Grate bar



C. A. WARG GRATE BAR June 8;. 1937.

Original Filed March 15, 1923 Wm WW uu Pp INVENTORIIV? a e 6Z7 AfTORNEYPatented June 8, 1937 UNITED STATES PATENT OFFICE GRATE BAR Charles A.Warg, Scranton, Pa., assignor to Me- Clave-Brooks Company, Scranton,Pa., a corporation of Pennsylvania Original application March 13, 1928,Serial No.

261,361. Divided and this application November 5, 1934, Serial No.751,618

3 Claims. (01. 126-180) The present invention relates to furnace gratesand has for its principal object the provision of a simple and efficientdumping grate suitable for high or low pressure heating installations.

The invention provides certain improvements in a grate of this typewhich lower the cost of production, improve operating efiiciency, andfacilitate the replacement of worn and broken parts. The invention alsoprovides an improved mounting of the tops on the grate bars, thisimprovement eliminating the necessity of cored bars, which arecomparatively expensive to manufacture. Other improvements effected bythe invention are recited more fully in the claims.

In the drawing:-

Figure 1 is a plan view of the front part of the grate, showing one rowof the grate bar tops in horizontal section.

Figure 2 is a side elevation of one of the grate bars.

Figure 3 is a transverse sectional view of a pair of grate bar tops.

Figure 4 is a vertical longitudinal section thru a grate showing a topin place.

The carrier bars 20, which are of truss form, carry the journal bearingsof the several grate bars, and are supported on the usual front and rearplates, not shown, and are connected at the front by the frame end 25which is interlocked with the carrier bars by the engagement ofdove-tail tenons 26 at the ends of the front frame end or bar incorrespondingly shaped slots in the carrier bars.

The grate has from two to ten grate bars 28, each supporting a number ofindependently removable tops 29, the top at one side being shown as offractional width. Each grate bar 28 is a rectangular hollow casting ofthe construction clearly shown in Figures 1 and 2. The bar is open atthe top and bottom and closed at the ends, and is divided into foursections by partition walls 46, each section being adapted to seat oneof the four tops. The bar is provided with opposed ribs 40a, whichproject inwardly from the sides of the bar in pairs at points midwaybetween the partitions 40 to position the central web of the top. Formedintegrally with each grate bar is the usual depending lug 4| having alaterally projecting pin 42 for attachment to the connecting bar 43. Thebar 43 is attached to a connecting rod such as 45, which extends thruapertures in the metal front of the furnace for convenient manipulationin usual manner, and as fully illustrated in my copending application,Serial No. 261,361, filed March 13, 1928, of which this case is adivision, now Patent No. 2,003,729 dated June 4, 1935.

The grate bar tops 29 are best illustrated in Figures 1 and 3. Each topis of familiar elongated rectangular form having beveled ends which areadapted to overlap and be overlapped respectively by the ends ofadjacent tops, and the sides of the tops may be rabbeted in the smallermesh sizes, as shown in Figure 3, so that adjacent tops on the same baroverlap, this construction preventing sifting between the sides of thetops as well as between the ends of the tops. Each top is formed with acentral downwardly projecting web 50, so that the shank has inhorizontal section the form of an I-beam, as clearly shown in Figure 1.This side flanged shank pro-- jects down thru the space in the hollowgrate bar defined by adjacent partitions 40, or between the end walls ofthe bar and the partition adjacent thereto, the central web 50 of thedepending socket piece or shank entering between opposite ribs 40a. Thetops are held in position by means of split pins 5| which are driventhru slots 52 in ears or tabs 53 extending from the bottom edge of web50, these pins bridging the lower edges of the side walls of the gratebar and thus securely holding the tops on the bar. It will be observedthat this method of mounting the tops on the bars does not require anycoring of the bars nor any appreciable machine work on the bars or tops,the construction of these parts being therefore rendered simple andeconomical while at the same time the construction is as durable and aseflicient as the more expensive constructions heretofore employed.

What I claim is:

1. A grate bar consisting of a rectangular casting open at the top andbottom and having transverse walls forming a number of compartments anda pair of opposite ribs projecting inwardly from the side walls of eachcompartment, a grate top for each compartment having a depending portionwhich has the form of an I-beam in horizontal cross section, ribs forpreventing the flanges of said depending portion from abutting the endwalls of the compartment and the web passing between said ribs, and asplit pin passing through said'web and engaging the bottom edges of thebar.

2. A grate bar consisting of a pair of elongated vertical side wallsheld in spaced parallel relation by a plurality of integral transversewalls, said walls forming a series of open 0pposed vertical cells orsockets, a pair of vertical ribs in each cell projecting inwardly fromthe central portion of opposite side walls, a grate top for each cellhaving a depending portion which has the form of an I-beam in horizontalcross section and having its web located between the ends of said ribs,the flanges of said depending portion being spaced from said ribs forproviding air cells, and. a split pin passing thru said web and engagingthe bottom edges of the side walls and of said ribs, thereby leaving theair cells open at the bottom.

3. A grate bar top having a depending portion in the form of a verticalI-beam having a web and flanges, characterized by the provision of avertical rib disposed on each outside Surface formed by the two flangesat each end of the web, whereby said grate bar is easily removed fromengagement with its supporting structure.

CHARLES A. WARG.

